Hello.
We have 4 AD sites in different regions with Exchange 2013 servers (CAS and MB roles at 1 server), and central office with 2 CAS and 2 MB servers in 1 DAG.
CASs in two AD sites generate huge traffic in WAN (netstat shows connections between local CAS and MB in remote site).
Shadow Redundancy is off. There are not users who has mailboxes at remote MB server.
Traffic about 1 GB per day.
How can i determine the problem?